Supercharging method for internal-combustion engines



March 18, 1930. G. BECKER 1,750,919

7 SUPERCHARGING METHOD FOR INTERNAL COMBUSTION ENGINES Filed Aug. 2a, 1928 f .1. I w

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Patented Man 18, 1930 .UNITED'STATESV PATENT oFFrcE GABRIEL BECKER, OF CEARLOTTENBUBG; GERMANY surnncnaneme Mn'rrron roa mrEnNAL-comnnsrrorr nnemrs' Application filedAugust 28, 1928, Serial 110,302,577, and in Germany June 15, 1928.

The present invention relates to a supercharging method for internal combustion engines in which a portion of the exhaust gases are returned to the new charge for re-use as '6 inert gases.

The method according to the invention, consists in throttling the outflow of the excess gases and thus causing the returned exhaust gases to flow at excess pressure into the combustion chambers of the cylinders. By

, within wide limits whilst omitting a preliminary compressor for the gases contained in the charge. As the exhaust gases used as inert gases in the charge amount to about of the total quantity of gas in the charge,

the new method also has considerable advan-" tages if oxygen or an equivalent combustion supporting gas is supplied by a small auxiliary compressor in the form of gas.

Further details of the invention will be seen from the following description with reference to the accompanying drawing which shows an example of an arrangement for carrying the method into efiect.

Fig. 1 illustrates diagrammatically an internal c ombustion'engine having my'inventionapplied thereto. I

Fi 2 illustrates one form of muffler which may e used in connection therewith.

The exhaust gases from an internal combustion engine a are conducted by an exhaust ipe n to a condenser and water separator b in which the exhaust gases are cooled and the water va our formed by the combustion is condense From the condenser b an outflow pi 0 leads through a throttle member e eitiliiar into the atmosphere or for suitable purposes, for instance to muflle the noise of the explosions, into water d which is at a level It. A return pipe fincludes a valve '5 and leads to the mixer or carburetter of the internal combustion. engine. When t e throttle member e is com letely open the exhaust gases and the con ensed water contained therein pass directly into the outflow pipe 0. By operating the throttle member e the free pas sage through the pipe 0 can be reduced whereby an increase in ressure occurs in the outflow pipe and in t e return pipe f so that a portion of the exhaust gases flows through the return pipe 7 under pressure into the mixer g. In this, manner the charge is increased and'the output of the internal combustion engine increased whilst the excess exhaust gases and the condensed water vapour pass out through the outflow pipe 0. For the purpose of equalizing the pressure in the various parts of 5 the internal combustion engine illustrated in the drawing by way of pipe 32 leading to t e pipe fat a point in advance of the point Z at which the Ipipe L provided with the control member. 1 plies oxygen or the like into exhaust gases passing through the pipe f. .The pipe p could also be connected to the ipe n, which the exhaust gases pass omthe cylinders to the condenser bfor the same purposes. The oxygen is contained in the container an under pressure either by automatically loading the container or by connecting it to the exhaust pipe at or the return ipe f. The oxygen may be in any. suitable arm.-

In cases of a considerable counter pressure in the outflow pipe 0, for example by reason of high level h of water d, the pressure can 9. be adjusted by means of the valve 5 in the return pipe 7'. By means of the two valves 6 and i the pressure of.the gases can be adjusted at such a degree as to prevent the water d from passing into the exhaust/pipe,

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through 3 I claim 1. The method of supercharging internal. combustion engines which comprises returning a portion of the exhaust gases from the 5 engine to the combustion chamber under pres- I sure derived directly from the exhaust pressure,-and introducing fuel and'oxygen under pressure into the returning exhaustgases.

2. The method of supercharging internal m combustion engines which comprises permitting a portion only of the exhaust gases from an engine to escape, returning the remaining portionof such gases to the combustion chamber under a pressure determined by the rate of escapement of the gases. p

3. In apparatus for supercharging an internal combustion engine having exhaust and inlet conduits, the combination with means in said exhaust conduit for throttling the ex-.

haust gases to control the escape thereof, of a conduit connecting said inlet conduit with' said exhaust conduit intermediate the engine and said means whereby a portion of the exhaust gases are returned to the engine under pressure obtained by throttling, and means connected with said inlet conduit for introducing fuel and combustion supporting gas therein.

" 4. In'apparatus for supercharging an internal combustion engine having exhaust and inlet conduits, the combination with means in said exhaust conduit for throttling the exhaust gases to control the escape thereof, of a conduit connecting said inlet conduit with 85 said exhaust conduit intermediate the engine and said means whereby a portion of the exhaust gases are returned to the engine under pressure obtained by throttling, and means connected with said inlet conduit for intro- 40 ducing fuel and combustion supporting gas therein, and a connection to said inlet conduit in advance of the point of connection of said last named means thereto for supplying pressure to the fuel and combustion supporting GABRIEL BECKER. 

